earth science
a plant or animal species that is no longer living
what is extinct
_____ is a push or a pull
force
smallest unit of structure of all living things
what is a cell?
when a gas changes to a liquid
what is condensation?
which weighs more: a ton of bricks or a ton of feathers?
which gas do plants release through photosynthesis
oxygen
stored energy that an object has because of its position or condition
potential energy
living things that make their own food (ex: plants)
producers
the 3 states of matter
what is solid, liquid, gas
how old is the earth
4.5 billion years
preserved remains or traces of living things in rock
what are fossils?
the man who "discovered" gravity
isaac newton
organelle that stores DNA
nucleus
the first element on the peridoic table
hydrogen
what was the first animal in space
a fruit fly
you can measure ____ by dividing distance over time
speed
organisms that break down dead plants and animals (ex: worms, bacteria)
decomposers
the charge of a proton
positive
how many bones are in the adult human body
206
green pigment that plants use to make food
chlorophyll
An object at rest will stay at rest, and an object in motion will stay in motion, unless acted upon by another force (inertia)
what does DNA stand for
deoxyribonucleic acid
what is measued by the pH scale
acidity
what organism produces 50-80% of earth's oxygen
phytoplankton